java - ArrayList generics -

could me explain ma.add(new highrights("aaa")); does?

main class:

public static void main(string [] a){             arraylist<securityrights> ma=new arraylist<securityrights>();             ma.add(new highrights("aaa"));            } 

highrights class:

public class highrights extends securityrights {     private string name;      public highrights(string n){     super(true);     this.name = n;    }      public string getname(){         return name;     }       public static void main(string[] a){      highrights s= new highrights("lisa");     system.out.print(s.getname() +" "+s.getsecret());                   }  } 

this simple inheritance example.

ma.add(new highrights("aaa"));  

it adds new object of highrights class list<securityrights> array list ma.

highrights extends securityrights 

this inheritance. possible store child object highrights parent object securityrights.

please read inheritance